//////////////////////////////////////////////////
//改编摘自：http://www.cnblogs.com/daixinyu/p/6715398.html
//hjl 2017年6月19日19:25:43
////////////////////////////////////////////////////
function watermark(settings) {
  //默认设置
  var defaultSettings = {
    watermark_txt0: "",
    watermark_txt1: "",
    watermark_txt2: "", //根据本业务需求  有三行 换行显示  创建三个节点
    watermark_x: 20, //水印起始位置x轴坐标
    watermark_y: 20, //水印起始位置Y轴坐标
    watermark_rows: 8, //水印行数
    watermark_cols: 10, //水印列数
    watermark_x_space: 100, //水印x轴间隔
    watermark_y_space: 50, //水印y轴间隔
    watermark_color: '#aaa', //水印字体颜色
    watermark_alpha: 0.2, //水印透明度
    watermark_fontsize: '15px', //水印字体大小
    watermark_font: '微软雅黑', //水印字体
    watermark_width: 210, //水印宽度
    watermark_height: 80, //水印长度
    watermark_angle: 20 //水印倾斜度数
  };
  //采用配置项替换默认值，作用类似jquery.extend
  if (arguments.length === 1 && typeof arguments[0] === "object") {
    var src = arguments[0] || {};
    for (key in src) {
      if (src[key] && defaultSettings[key] && src[key] === defaultSettings[key])
        continue;
      else if (src[key])
        defaultSettings[key] = src[key];
    }
  }

  var oTemp = document.createDocumentFragment();

  //获取页面最大宽度
  var page_width = Math.max(document.body.scrollWidth, document.body.clientWidth);
  var cutWidth = page_width * 0.0150;
  var page_width = page_width - cutWidth;
  //获取页面最大高度
  var page_height = Math.max(document.body.scrollHeight, document.body.clientHeight) + 450;
  // var page_height = document.body.scrollHeight+document.body.scrollTop;
  //如果将水印列数设置为0，或水印列数设置过大，超过页面最大宽度，则重新计算水印列数和水印x轴间隔
  if (defaultSettings.watermark_cols == 0 || (parseInt(defaultSettings.watermark_x + defaultSettings.watermark_width * defaultSettings.watermark_cols + defaultSettings.watermark_x_space * (defaultSettings.watermark_cols - 1)) > page_width)) {
    defaultSettings.watermark_cols = parseInt((page_width - defaultSettings.watermark_x + defaultSettings.watermark_x_space) / (defaultSettings.watermark_width + defaultSettings.watermark_x_space));
    defaultSettings.watermark_x_space = parseInt((page_width - defaultSettings.watermark_x - defaultSettings.watermark_width * defaultSettings.watermark_cols) / (defaultSettings.watermark_cols - 1));
  }
  //如果将水印行数设置为0，或水印行数设置过大，超过页面最大长度，则重新计算水印行数和水印y轴间隔
  if (defaultSettings.watermark_rows == 0 || (parseInt(defaultSettings.watermark_y + defaultSettings.watermark_height * defaultSettings.watermark_rows + defaultSettings.watermark_y_space * (defaultSettings.watermark_rows - 1)) > page_height)) {
    defaultSettings.watermark_rows = parseInt((defaultSettings.watermark_y_space + page_height - defaultSettings.watermark_y) / (defaultSettings.watermark_height + defaultSettings.watermark_y_space));
    defaultSettings.watermark_y_space = parseInt(((page_height - defaultSettings.watermark_y) - defaultSettings.watermark_height * defaultSettings.watermark_rows) / (defaultSettings.watermark_rows - 1));
  }
  var x;
  var y;
  for (var i = 0; i < defaultSettings.watermark_rows; i++) {
    y = defaultSettings.watermark_y + (defaultSettings.watermark_y_space + defaultSettings.watermark_height) * i;
    for (var j = 0; j < defaultSettings.watermark_cols; j++) {
      x = defaultSettings.watermark_x + (defaultSettings.watermark_width + defaultSettings.watermark_x_space) * j;

      var mask_div = document.createElement('div');
      mask_div.id = 'mask_div' + i + j;
      mask_div.className = 'mask_div';
      ///三个节点
      var span0 = document.createElement('div');
      span0.appendChild(document.createTextNode(defaultSettings.watermark_txt0));
      var span1 = document.createElement('div');
      span1.appendChild(document.createTextNode(defaultSettings.watermark_txt1));
      var span2 = document.createElement('div');
      span2.appendChild(document.createTextNode(defaultSettings.watermark_txt2));
      mask_div.appendChild(span0);
      mask_div.appendChild(span1);
      mask_div.appendChild(span2);
      //设置水印div倾斜显示
      mask_div.style.webkitTransform = "rotate(-" + defaultSettings.watermark_angle + "deg)";
      mask_div.style.MozTransform = "rotate(-" + defaultSettings.watermark_angle + "deg)";
      mask_div.style.msTransform = "rotate(-" + defaultSettings.watermark_angle + "deg)";
      mask_div.style.OTransform = "rotate(-" + defaultSettings.watermark_angle + "deg)";
      mask_div.style.transform = "rotate(-" + defaultSettings.watermark_angle + "deg)";
      mask_div.style.visibility = "";
      mask_div.style.position = "absolute";
      mask_div.style.left = x + 'px';
      mask_div.style.top = y + 'px';
      mask_div.style.overflow = "hidden";
      mask_div.style.zIndex = "9999";
      mask_div.style.pointerEvents = 'none'; //pointer-events:none  让水印不遮挡页面的点击事件
      //mask_div.style.border="solid #eee 1px";
      mask_div.style.opacity = defaultSettings.watermark_alpha;
      mask_div.style.fontSize = defaultSettings.watermark_fontsize;
      mask_div.style.fontFamily = defaultSettings.watermark_font;
      mask_div.style.color = defaultSettings.watermark_color;
      mask_div.style.textAlign = "center";
      mask_div.style.width = defaultSettings.watermark_width + 'px';
      mask_div.style.height = defaultSettings.watermark_height + 'px';
      mask_div.style.display = "block";
      oTemp.appendChild(mask_div);
    };
  };
  document.body.appendChild(oTemp);
}

//对Date的扩展，将 Date 转化为指定格式的String
//月(M)、日(d)、小时(h)、分(m)、秒(s)、季度(q) 可以用 1-2 个占位符，
//年(y)可以用 1-4 个占位符，毫秒(S)只能用 1 个占位符(是 1-3 位的数字)
//例子：
//(new Date()).Format("yyyy-MM-dd hh:mm:ss.S") ==> 2006-07-02 08:09:04.423
//(new Date()).Format("yyyy-M-d h:m:s.S")      ==> 2006-7-2 8:9:4.18
//author: meizz
Date.prototype.Format = function (fmt) {
  var o = {
    "M+": this.getMonth() + 1, //月份
    "d+": this.getDate(), //日
    "h+": this.getHours(), //小时
    "m+": this.getMinutes(), //分
    "s+": this.getSeconds(), //秒
    "q+": Math.floor((this.getMonth() + 3) / 3), //季度
    "S": this.getMilliseconds() //毫秒
  };
  if (/(y+)/.test(fmt)) fmt = fmt.replace(RegExp.$1, (this.getFullYear() + "").substr(4 - RegExp.$1.length));
  for (var k in o)
    if (new RegExp("(" + k + ")").test(fmt)) fmt = fmt.replace(RegExp.$1, (RegExp.$1.length == 1) ? (o[k]) : (("00" + o[k]).substr(("" + o[k]).length)));
  return fmt;
}

function getTime() {
  return new Date().Format("yyyy年MM月dd日 hh:mm:ss");
}